Artificial nail

ABSTRACT

Disclosed is an artificial nail. The artificial nail according to an embodiment of the present disclosure includes a nail body, a design layer attached to an upper surface of the nail body, and a 3-dimensional coating layer of an upwardly convex transparent dome shape on the design layer.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to Korean Patent Application No. 10-2021-0076928 filed on Jun. 14, 2021 and all the benefits accruing therefrom under 35 U.S.C. § 119, the contents of which in its entirety are herein incorporated by reference.

BACKGROUND 1. Field

The present disclosure relates to an artificial nail with a 3-dimensional effect and an improved esthetic appearance.

2. Description of the Related Art

Users attach artificial nails with designs of various colors and shapes to fingernails or toenails to enhance and elongate the appearance of the fingernails or toenails.

In particular, to give a 3-dimensional (3D) effect to artificial nails, 3D decorations are adhered to nail bodies of the artificial nails using liquid adhesives or coating solutions. The 3D decorations have a 3D shape, and include, for example, artificial jewelry, studs, Rhinestone, metal craft and beads.

However, when the liquid adhesives are used, it takes a long time to adhere the 3D decorations to the nail bodies due to the weight of the 3D decorations and the viscosity of the liquid adhesives, and the adhesives leak off the side of the decorations, causing contamination of the nail bodies.

Additionally, in case that design layers having various colors or patterns are attached to the nail bodies of the artificial nails, since the design layers have a flat or planar shape, wrinkling occurs in the process of attaching the design layers to the nail bodies having a 3D curved surface, and it takes a long time to remove the wrinkles.

RELATED LITERATURES Patent Literature

(Patent Literature 1) Korean Patent No. 10-1239735 (published on Mar. 6, 2013)

SUMMARY

Therefore, the present disclosure is directed to providing an artificial nail for giving a 3-dimensional (3D) effect without using 3D decoration while preventing wrinkling that occurs when attaching a design layer to a nail body.

According to an aspect of the present disclosure, there is provided an artificial nail including a nail body, a design layer attached to an upper surface of the nail body, and a 3D coating layer of an upwardly convex transparent dome shape on the design layer.

A lower surface of the 3D coating layer may be formed in a shape corresponding to a shape of an upper surface of the design layer.

A thickness at a center of the 3D coating layer may be 300 to 2000 um, and the thickness of the 3D coating layer may decrease from center to edge.

The artificial nail may further include a first protection coating layer on the 3D coating layer, wherein the first protection coating layer makes smooth connection between the 3D coating layer and the nail body, and covers the entire upper surface of the nail body to protect the 3D coating layer.

A thickness of the first protection coating layer may be 20 to 400 um.

The artificial nail may further include a multilayer coating layer on the first protection coating layer, wherein the multilayer coating layer covers the first protection coating layer and has various changes in color or pattern depending on a viewing direction; and a second protection coating layer on the multilayer coating layer, wherein the second protection coating layer covers the multilayer coating layer to protect the multilayer coating layer.

According to another aspect of the present disclosure, there is provided an artificial nail including a nail body having an attachment region on an upper surface, the attachment region formed in a straight line shape in a lengthwise direction and a curve shape in a widthwise direction, and a design layer attached to the attachment region.

The design layer may include a dichroic film and a holographic film having a change in color or pattern depending on a viewing direction.

A lower surface of the nail body may have a radius of curvature corresponding to a shape of a fingernail or a toenail, and a widthwise radius of curvature of the attachment region may be larger than a widthwise radius of curvature of the lower surface of the nail body.

A ratio of the widthwise radius of curvature of the attachment region to the widthwise radius of curvature of the lower surface of the nail body may be 1.05 to 4.0.

A ratio of a length of the attachment region to a length of the nail body may be 0.4 to 0.8, and a ratio of a width of the attachment region to a width of the nail body may be 0.45 to 0.8.

The embodiments of the present disclosure may give a 3D effect to the artificial nail by the upwardly convex dome-shaped 3D coating layer on the nail body and the design layer.

Additionally, the embodiments of the present disclosure may provide a glossy appearance and enhance the size and color of the design layer by the transparent dome-shaped 3D coating layer having the convex lens effect.

Additionally, the embodiments of the present disclosure may prevent wrinkling that occurs in the design layer when attaching the design layer to the nail body.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an artificial nail according to a first embodiment of the present disclosure.

FIG. 2 is an exploded perspective view of an artificial nail according to a first embodiment of the present disclosure.

FIG. 3 is a side view of an artificial nail according to a first embodiment of the present disclosure.

FIG. 4 is a front view of an artificial nail according to a first embodiment of the present disclosure.

FIG. 5 is a top view of an artificial nail according to a first embodiment of the present disclosure.

FIG. 6 is a top view of a nail body according to a first embodiment of the present disclosure.

FIG. 7 is a cross-sectional view of FIG. 6 , taken along the line A-A.

FIG. 8 is a cross-sectional view of FIG. 6 , taken along the line B-B.

FIG. 9 is a perspective view of an artificial nail according to a second embodiment of the present disclosure.

FIG. 10 is an exploded perspective view of an artificial nail according to a second embodiment of the present disclosure.

FIG. 11 is a side view of an artificial nail according to a second embodiment of the present disclosure.

FIG. 12 is a front view of an artificial nail according to a second embodiment of the present disclosure.

DETAILED DESCRIPTION

For a full understanding of the present disclosure, the advantages of the operation of the present disclosure and the objectives achieved by the embodiment of the present disclosure, a reference is made to the accompanying drawings showing the exemplary embodiments of the present disclosure and the context described in the accompanying drawings.

Hereinafter, the present disclosure will be described in detail by describing the exemplary embodiments of the present disclosure with reference to the accompanying drawings. The like reference signs presented in each drawing indicate the like elements.

An artificial nail according to a first embodiment of the present disclosure will be described below.

FIG. 1 is a perspective view of the artificial nail according to the first embodiment of the present disclosure, FIG. 2 is an exploded perspective view of the artificial nail according to the first embodiment of the present disclosure, FIG. 3 is a side view of the artificial nail according to the first embodiment of the present disclosure, FIG. 4 is a front view of the artificial nail according to the first embodiment of the present disclosure, FIG. 5 is a top view of the artificial nail according to the first embodiment of the present disclosure, FIG. 6 is a top view of a nail body according to the first embodiment of the present disclosure, FIG. 7 is a cross-sectional view of FIG. 6 , taken along the line A-A, and FIG. 8 is a cross-sectional view of FIG. 6 , taken along the line B-B.

Referring to FIGS. 1 to 8 , the artificial nail 100 according to the first embodiment of the present disclosure includes a nail body 110, a design layer 120 attached to the upper surface of the nail body 110, a dome-shaped 3-dimensional (3D) coating layer 130 on the design layer 120 and a first protection coating layer 140 on the 3D coating layer 130.

The lower surface of the nail body 110 according to this embodiment is adhered to an object, for example, a fingernail and a toenail. Additionally, since the object, for example, a fingernail and a toenail, to which the nail body 110 is adhered has a 3D curved surface, the nail body 110 has a 3D curved surface shape corresponding to the shape of the object, for example, a fingernail.

In this embodiment, the nail body 110 may be formed from any one of polymethyl methacrylate (PMMA) and acrylonitrile-butadiene-styrene copolymer (ABS) or a combination thereof, and the scope of protection of the present disclosure is not limited thereto, and the nail body 110 may be formed from a variety of materials.

The nail body 110 may be formed in the shape corresponding to the shape of the fingernail, and a lengthwise (X direction) radius of curvature of the nail body 110 may be larger than its widthwise (Y direction) radius of curvature.

Additionally, the upper surface of the nail body 110 is formed in a shape corresponding to the shape of the design layer 120 as described below, and has an attachment region 111 to which the design layer 120 is attached. Here, the edge of the design layer 120 and the edge of the attachment region 111 may be brought into close contact with each other.

The design layer 120 according to this embodiment may be a transparent or opaque film or sheet that is attached to the attachment region 111 on the upper surface of the nail body 110.

The design layer 120 may be formed by printing color ink on the upper or lower surface of a substrate film or a substrate sheet by screen printing, offset printing and gravure printing.

The design layer 120 may be formed by printing the entire upper or lower surface of the substrate film or the substrate sheet with one color, or dividing the entire upper or lower surface into a plurality of regions and repeatedly printing each region with different colors or predetermined colors.

Additionally, the design layer 120 may comprise the substrate film or the substrate sheet itself having at least one color. Additionally, the design layer 120 may be formed by stacking a plurality of substrate films or substrate sheets having different colors.

Additionally, the design layer 120 may be formed by printing various colors or patterns in layers on the upper or lower surface of the substrate film or the substrate sheet to provide a holographic effect that as the viewing direction changes, the colors or patterns variously change. Accordingly, with various changes in color depending on the viewing direction, the artificial nail 100 may have an iridescent effect like rainbow and a glitter effect like diamond.

For example, the design layer 120 may include a dichroic film having a rainbow-like iridescent effect and a holographic film having a holographic effect. Accordingly, the artificial nail 100 according to this embodiment may make nails iridescent like rainbow or look sparkly like diamond.

Additionally, the design layer 120 may have a metal thin film of, for example, aluminum (Al), nickel (Ni) and chrome (Cr), deposited on the upper or lower surface of the substrate film or the substrate sheet, and the deposited metal thin film may provide the effect of various metals and the holographic effect that colors or patterns variously change as the viewing direction changes. Additionally, the metal thin film may be transparent or opaque depending on the thickness.

Additionally, the upper surface of the design layer 120 may have pearl and glitter.

Meanwhile, in this embodiment, the substrate film or the substrate sheet that constitutes the design layer 120 may be a transparent or opaque film or sheet made of any one selected from poly vinyl chloride (PVC), polyethylene (PE), polyurethane (PU), polypropylene (PP), polyethylene terephthalate (PET), polyolefin elastomer (POE), ethylene-vinyl acetate copolymer (EVA) and acrylic resin or a copolymer thereof. However, the above enumerated materials of the substrate film or the substrate sheet are provided for illustrative purposes, but are not limited thereto.

Meanwhile, wrinkling may occur in the design layer 120 when attaching the design layer 120 of a flat or planar shape to the nail body 110 having a 3D curved surface.

The design layer 120 having a plurality of fully cut lines has been formed to prevent wrinkling that may occur in the design layer 120, but in case that the plurality of fully cut lines is formed in the design layer 120, the aesthetics of the design layer 120 reduces, and the task efficiency reduces due to the formation of the fully cut lines in the design layer 120.

Accordingly, in this embodiment, the nail body 110 has, on the upper surface, the attachment region 111 to which the design layer 120 is attached. Additionally, in this embodiment, the attachment region 111 is formed in a straight line shape in the lengthwise direction (X direction) and is rounded into a curve shape in the widthwise direction (Y direction) to prevent wrinkling that occurs in the design layer 120 when attaching the design layer 120 to the attachment region 111 on the upper surface of the nail body 110.

FIG. 7 is a cross-sectional view of the nail body 110 taken along the widthwise direction, showing that the attachment region 111 is rounded into a curve shape in the widthwise direction (Y direction), and FIG. 8 is a cross-sectional view of the nail body 110 taken along the lengthwise direction, showing that the attachment region 111 is formed in a straight line shape in the lengthwise direction (X direction).

In this embodiment, since the design layer 120 has a flat or planar shape, wrinkling occurs when attaching the design layer 120 to the nail body 110 having a 3D curved surface, so the attachment region 111 may be formed in a straight line shape in a direction, i.e., the lengthwise direction (X direction) as shown in FIG. 8 .

Additionally, the attachment region 111 according to this embodiment is rounded into a curve shape in the widthwise direction (Y direction). As shown in FIG. 7 , the attachment region 111 may have an arc shape having a predetermined radius of curvature (radius of curvature) in the widthwise direction (Y direction). Although FIG. 7 shows that the attachment region 111 has an arc shape in the widthwise direction, the present disclosure is not limited thereto and the attachment region 111 may be rounded into a curve shape including a free curve having multi-radius of curvature in the widthwise direction.

When compared with the lower surface of the nail body 110 having the radius of curvature corresponding to the shape of the object, for example, a fingernail or a toenail, the widthwise radius of curvature of the attachment region 111 to which the design layer 120 is attached may be larger than the widthwise radius of curvature of the lower surface of the nail body 110. Accordingly, the upper surface of the nail body 110 may have different widthwise radii of curvature at the attachment region 111 and other region than the attachment region 111.

FIG. 7 is an exemplary diagram of the widthwise (Y direction) cross section of the nail body 110, showing the lower surface of the nail body 110 and the curved surface of the attachment region 111 on the upper surface of the nail body 110.

Additionally, the widthwise (Y direction) radius of curvature R2 of the attachment region 111 may be larger than the widthwise (Y direction) radius of curvature R3 of the lower surface of the nail body 110.

When the attachment region 111 has the widthwise (Y direction) curved surface as shown in FIG. 7 , the widthwise radius of curvature R2 of the attachment region 111 may be 4 to 20 mm in case that the object is a fingernail and may be 8 to 45 mm in case that the object is a toenail, and the widthwise radius of curvature R1 of the upper surface of the nail body 110 except the attachment region 111 may be 3 to 8 mm in case that the object is a fingernail and may be 6 to 12 mm in case that the object is a toenail.

Additionally, in this embodiment, the widthwise radius of curvature R3 of the lower surface of the nail body 110 may be 3 to 8 mm in case that the object is a fingernail and may be 6 to 12 mm in case that the object is a toenail.

In FIGS. 7 and 8 , a ratio of the widthwise radius of curvature R2 of the attachment region 111 to the widthwise radius of curvature R3 of the lower surface of the nail body 110 may be 1.05 to 4.0.

In case that the ratio of the widthwise radius of curvature R2 of the attachment region 111 to the widthwise radius of curvature R3 of the lower surface of the nail body 110 is smaller than 1.05, wrinkling may occur in the design layer 120 when attaching the design layer 120 to the attachment region 111. Additionally, in case that the ratio of the widthwise radius of curvature R2 of the attachment region 111 to the widthwise radius of curvature R3 of the lower surface of the nail body 110 is larger than 4.0, due to the large difference between the radius of curvature R3 of the lower surface of the nail body 110 and the radius of curvature R2 of the attachment region 111, the thickness of the nail body 110 increases, so it does not feel light and comfortable to wear. Additionally, in case that the ratio of the widthwise radius of curvature R2 of the attachment region 111 to the widthwise radius of curvature R3 of the lower surface of the nail body 110 is larger than 4.0, the thickness of the nail body 110 increases in a direction from the center of the attachment region 111 to the end, so it does not feel light and comfortable to wear and the esthetics in the shape of the nail body 110 reduces.

Meanwhile, in this embodiment, the nail body 110 has the flexural modulus of 1 to 20 MPa to easily adhere the artificial nail 100 to the object, for example, a fingernail and a toenail, with the design layer 120 attached to the upper surface of the nail body 110.

Accordingly, when the nail body 110 has the attachment region 111 on the upper surface, limits may be imposed on the minimum size and the maximum size of the attachment region 111 on the upper surface of the nail body 110 to reduce or eliminate inconvenience in adhering the artificial nail 100 to the object, for example, a fingernail. This may be indicated as a ratio of the length and/or width of the attachment region 111 and the length and/or width of the nail body 110 affecting the flexural modulus of the artificial nail 100.

As shown in FIG. 6 , preferably, the ratio of the length L2 of the attachment region 111 to the length L1 of the nail body 110 is 0.4 to 0.8, and the ratio of the width W2 of the attachment region 111 to the width W1 of the nail body 110 is 0.45 to 0.8.

That is, in this embodiment, the minimum size of the attachment region 111 is such that the length L2 of the attachment region 111 is 45% of the length L1 of the nail body 110 and the width W2 of the attachment region 111 is 40% of the width W1 of the nail body 110. Additionally, the maximum size of the attachment region 111 is such that the length L2 of the attachment region 111 is 80% of the length L1 of the nail body 110 and the width W2 of the attachment region 111 is 80% of the width W1 of the nail body 110.

As the flexural modulus of the nail body 110 may be maintained between 1 and 20 MPa by the length L2 and/or the width W2 of the attachment region 111, it is possible to easily adhere the artificial nail 100 to the object, for example, a fingernail.

Additionally, to easily adhere the nail body 110 to the fingernail, the flexural modulus of the nail body 110 on the two sides in the widthwise direction is important. Accordingly, since the nail body 110 has a curved surface shape with the continuously increasing thickness in a direction from the widthwise (Y direction) end to the center as shown in FIG. 7 , it is necessary to limit the widthwise thickness of the nail body 110 such that the widthwise flexural modulus of the nail body 110 is within the range of 1 to 20 MPa when the nail body 110 is pressed down.

As shown in FIG. 7 , the thickness T1 of the nail body 110 at the edge position P2 of the attachment region 111 may be 0.1 to 1.7 mm, and the thickness T2 of the nail body 110 at the intermediate position P3 on the upper surface of the nail body 110 between the widthwise (Y direction) end position P1 of the nail body 110 and the edge position P2 of the attachment region 111 may be 0.1 to 0.5 mm.

The widthwise flexural modulus of the nail body 110 may be maintained between 1 and 20 MPa by adjusting the widthwise (Y direction) thickness of the nail body 110, thereby easily adhering the artificial nail 100 to the object, for example, a fingernail.

Additionally, in this embodiment, the widthwise radius of curvature R1 of the upper surface of the nail body 110 except the attachment region 111 may be 3 to 8 mm in case that the object is a fingernail and may be 6 to 12 mm in case that the object is a toenail. Additionally, the widthwise radius of curvature R3 of the lower surface of the nail body 110 may be 3 to 8 mm in case that the object is a fingernail and may be 6 to 12 mm in case that the object is a toenail. In this instance, to meet the widthwise thickness of the nail body 110, a ratio of a distance D1 from the widthwise (Y direction) end position P1 of the nail body 110 to the edge position P2 of the attachment region 111 and a distance to the intermediate position P3 on the upper surface of the nail body 110 between the widthwise (Y direction) end position P1 of the nail body 110 and the edge position P2 of the attachment region 111 may be 2.5 to 6.5:1.2 to 3.5.

The 3D coating layer 130 according to this embodiment is on the design layer 120 and has an upwardly convex dome shape. The 3D coating layer 130 having a dome shape provides a 3D effect.

Additionally, since the 3D coating layer 130 has a transparent dome shape, it has the convex lens effect, which increases the light scattering, thereby providing a glossy appearance (i.e., enhanced gloss) and enhancing the size and color of the design layer 120 by light refraction.

Additionally, the 3D coating layer 130 covers the design layer 120 to protect the design layer 120 from external impacts such as scratches or cracks.

The 3D coating layer 130 is formed from any one selected from poly vinyl chloride, polyethylene, polyurethane, polypropylene, polyethylene terephthalate, polyolefin elastomer, ethylene-vinyl acetate copolymer, acrylic resin, polystyrene, polyvinylidene chloride, thermoplastic polyurethane (TPU), polyester, a UV curable paint and a combination thereof, and optionally, a curing agent may be used to make flexible. However, the above enumerated materials of the 3D coating layer 130 are provided for illustrative purposes, but are not limited thereto.

In this embodiment, the coating method of the 3D coating layer 130 on the design layer 120 is not limited to a particular method, but preferably, comma coating and dispensing may be used to coat the 3D coating layer 130 on the design layer 120.

The thickness T3 of the 3D coating layer 130 may decrease from center to edge, and the thickness at the center of the 3D coating layer 130 may be 300 to 2000 um. When the thickness at the center of the 3D coating layer 130 is smaller than 300 um, the 3D effect of the artificial nail reduces. Additionally, when the thickness at the center of the 3D coating layer 130 is larger than 2000 um, it is difficult for the first protection coating layer 140 as described below to cover the 3D coating layer 130 to protect the 3D coating layer 130.

Since the 3D coating layer 130 covers the upper surface of the design layer 120, the lower surface of the 3D coating layer 130 is formed in a shape corresponding to the shape of the upper surface of the design layer 120. Additionally, the area of the 3D coating layer 130 may be equal to or smaller than the area of the design layer 120.

The first protection coating layer 140 according to this embodiment is formed from a transparent material. The first protection coating layer 140 is on the 3D coating layer 130 and covers all or part of the upper surface of the nail body 110.

The first protection coating layer 140 covers the 3D coating layer 130 to protect the 3D coating layer 130 from external impacts such as scratches or cracks, and makes smooth connection between the 3D coating layer 130 and the upper surface of the nail body 110.

The first protection coating layer 140 is formed from any one selected from polyurethane, polypropylene, polyethylene terephthalate, polyolefin elastomer, ethylene-vinyl acetate copolymer, acrylic resin, acetate-based resin, polystyrene, polyvinylidene chloride, thermoplastic polyurethane (TPU), polyester, a UV curable paint and a combination thereof, and optionally, a curing agent may be used to make flexible. However, the above enumerated materials of the first protection coating layer 140 are provided for illustrative purposes, but are not limited thereto.

In this embodiment, the coating method of the first protection coating layer 140 over the 3D coating layer 130 and the entire upper surface of the nail body 110 is not limited to a particular method, but preferably, a spraying method may be used to coat the first protection coating layer 140 over the 3D coating layer 130 and the entire upper surface of the nail body 110.

The thickness T4 of the first protection coating layer 140 may be 20 to 400 um.

When the thickness T4 of the first protection coating layer 140 is smaller than 20 um, the surface of the first protection coating layer 140 is not smooth. Additionally, as the thickness T3 of the 3D coating layer 130 increases, the thickness T4 of the first protection coating layer 140 increases, but since it is desirable that the first protection coating layer 140 protecting the 3D coating layer 130 has a small thickness T4, the thickness T4 of the first protection coating layer 140 does not exceed 400 um.

Hereinafter, an artificial nail according to a second embodiment of the present disclosure will be described.

FIG. 9 is a perspective view of the artificial nail according to the second embodiment of the present disclosure, FIG. 10 is an exploded perspective view of the artificial nail according to the second embodiment of the present disclosure, FIG. 11 is a side view of the artificial nail according to the second embodiment of the present disclosure, and FIG. 12 is a front view of the artificial nail according to the second embodiment of the present disclosure.

Referring to FIGS. 9 to 12 , the artificial nail 100 according to the second embodiment of the present disclosure includes a nail body 110, a design layer 120 attached to the upper surface of the nail body 110, a dome-shaped 3D coating layer 130 on the design layer 120, a first protection coating layer 140 on the 3D coating layer 130, a multilayer coating layer 150 on the first protection coating layer 140 and a second protection coating layer 160 on the multilayer coating layer 150.

The nail body 110, the design layer 120, the 3D coating layer 130 and the first protection coating layer 140 according to the second embodiment of the present disclosure are the same as the nail body 110, the design layer 120, the 3D coating layer 130 and the first protection coating layer 140 according to the first embodiment of the present disclosure, and its detailed description is omitted, and rather, difference(s), i.e., the multilayer coating layer 150 and the second protection coating layer 160 will be described.

The multilayer coating layer 150 according to this embodiment is on the first protection coating layer 140 and covers the entire upper surface of the first protection coating layer 140.

The multilayer coating layer 150 may be formed by coating different colors in layers on the upper surface of the first protection coating layer 140, or dividing the entire upper surface of the first protection coating layer 140 into a plurality of regions and repeatedly coating different colors or predetermined colors on each region.

Additionally, the multilayer coating layer 150 may be formed by coating different colors in layers on the upper surface of the first protection coating layer 140 to provide a holographic effect that as the viewing direction changes, the colors variously change. Accordingly, with changes in color depending on the viewing direction, the entire upper surface of the artificial nail 100 has an iridescent effect like rainbow and a glitter effect like diamond.

Additionally, the multilayer coating layer 150 may have an inorganic thin film of, for example, aluminum (Al), nickel (Ni), chrome (Cr), silicon dioxide (SiO₂) and titanium dioxide (TiO₂), deposited on the upper surface of the first protection coating layer 140, and the deposited inorganic thin film may provide the effect of various metals and the holographic effect that colors or patterns variously change as the viewing direction changes. Additionally, the inorganic thin film may be transparent or opaque depending on the thickness.

The thickness T5 of the multilayer coating layer 150 is preferably small, and may be 1 um or less.

The second protection coating layer 160 according to this embodiment is made of a transparent material. The second protection coating layer 160 is on the multilayer coating layer 150 and covers the entire upper surface of the multilayer coating layer 150.

The second protection coating layer 160 covers the multilayer coating layer 150 to protect the multilayer coating layer 150 from external impacts such as scratches or cracks.

The second protection coating layer 160 may be formed from any one selected from polyurethane, polypropylene, polyethylene terephthalate, polyolefin elastomer, ethylene-vinyl acetate copolymer, acrylic resin, acetate-based resin, polystyrene, polyvinylidene chloride, thermoplastic polyurethane (TPU), polyester, a UV curable paint and a combination thereof, and optionally, a curing agent may be used to make flexible.

However, the above enumerated materials of the second protection coating layer 160 are provided for illustrative purposes, but are not limited thereto.

In this embodiment, the coating method of the second protection coating layer 160 over the entire upper surface of the multilayer coating layer 150 is not limited to a particular method, but preferably, a spraying method may be used to coat the second protection coating layer 160 over the entire upper surface of the multilayer coating layer 150.

The thickness T6 of the second protection coating layer 160 is preferably 10 to 50 um.

The present disclosure is not limited to the disclosed embodiments, and it is obvious to those skilled in the art that a variety of modifications and changes may be made thereto without departing from the spirit and scope of the present disclosure. Therefore, it should be understood that such modifications or changes fall within the scope of protection of the present disclosure.

[Detailed Description of Main Elements] 100: Artificial nail 110: Nail body 111: Attachment region 120: Design layer 130: 3D coating layer 140: First protection coating layer 150: Multilayer coating layer 160: Second protection coating layer 

What is claimed is:
 1. An artificial nail, comprising: a nail body having a 3-dimensional (3D) curved surface shape, the nail body having an attachment region on an upper surface, wherein the attachment region is formed in a straight line shape in a lengthwise direction and a curve shape in a widthwise direction; and a design layer of a flat shape attached to the attachment region.
 2. The artificial nail according to claim 1, wherein a lower surface of the nail body has a radius of curvature corresponding to a shape of a fingernail or a toenail, and a widthwise radius of curvature of the attachment region is larger than a widthwise radius of curvature of the lower surface of the nail body.
 3. The artificial nail according to claim 2, wherein a ratio of the widthwise radius of curvature of the attachment region to the widthwise radius of curvature of the lower surface of the nail body is 1.05 to 4.0.
 4. The artificial nail according to claim 1, wherein a ratio of a length of the attachment region to a length of the nail body is 0.4 to 0.8, and a ratio of a width of the attachment region to a width of the nail body is 0.45 to 0.8.
 5. The artificial nail according to claim 1, wherein a ratio of a length of the attachment region to a length of the nail body is 0.4 to 0.8, and a ratio of a width of the attachment region to a width of the nail body is 0.45 to 0.8, so that a flexural modulus of the nail body is 1 to 20 MPa with the design layer attached to the attachment region, and the nail body has a curved surface shape with a continuously increasing thickness in a direction from a widthwise end to a center, wherein the thickness of the nail body at an edge position of the attachment region is 0.1 to 1.7 mm, and the thickness of the nail body at an intermediate position on the upper surface of the nail body between the widthwise edge position of the nail body and the edge position of the attachment region is 0.1 to 0.5 mm.
 6. The artificial nail according to claim 1, further comprising: a 3D coating layer having an upwardly convex transparent dome shape on the design layer.
 7. The artificial nail according to claim 6, wherein a thickness at a center of the 3D coating layer is 300 to 2000 um, and the thickness of the 3D coating layer decreases from center to edge.
 8. The artificial nail according to claim 6, further comprising: a first protection coating layer on the 3D coating layer, wherein the first protection coating layer makes smooth connection between the 3D coating layer and the nail body, and covers the entire upper surface of the nail body to protect the 3D coating layer, wherein an area of the 3D coating layer is equal to or smaller than an area of the design layer.
 9. The artificial nail according to claim 8, wherein a thickness of the first protection coating layer is 20 to 400 um.
 10. The artificial nail according to claim 8, further comprising: a multilayer coating layer on the first protection coating layer, wherein the multilayer coating layer covers the first protection coating layer and has various changes in color or pattern depending on a viewing direction; and a second protection coating layer on the multilayer coating layer, wherein the second protection coating layer covers the multilayer coating layer to protect the multilayer coating layer.
 11. The artificial nail according to claim 1, wherein the design layer includes a dichroic film and a holographic film having a change in color or pattern depending on a viewing direction. 